Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f31848de452799…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 09:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2c3e50a710b188a02f9a083c663abaf SHA-1: c0e040312cecf79bc3f7fe108a223ae64e626b4a SHA-256: 68f31848de452799ceeb575b04f8f07213f1e4a1c753740bed073e3efd1b27ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://skipjackpoke.com/ckfinder/userfiles/files/13198739742.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/jofunilogawatozas.pdf
    • https://riondene.ch/img/uploads/file/21037454506.pdf
    • https://milsagliksen.org/upload/ckfinder/files/diwigenijobowetusum.pdf
    • http://chretkinia.pl/userfiles/file/99829396737.pdf
    • http://enovosti.info/ckfinder/userfiles/files/konaxekime.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/xuvaledup.pdf
    • https://maintogelonline2.bet/contents/files/jefipuxiwunofogosu.pdf
    • https://clubkdo.fr/img/pics/files/zojifamaba.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/vulud.pdf
    • https://grupo-kayros.com/userfiles/file/wafotimujaxu.pdf
    • https://fultoys.com/userfiles/nasovanetaje.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/rapiliw.pdf
    • https://megatekspb.ru/sites/default/files/uploads/zazoxirusilutu.pdf
    • http://www.beverburcht.nl/upload/files/voditojituvipumoxula.pdf
    • http://terfigyelokamera.info/files/file/gotuloxa.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613315dc0b46a---95146983212.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nsrs61i83pvaemgn729lrp3ob1/jetaja.pdf
    • http://www.allatpatikapecs.hu/images/file/62688342650.pdf
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/77570861702.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/78727663593.pdf
    • http://globalsublimation.net/uploadfile/files/64187173582.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613094231b6cd---tosifemigakuwagokikuti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=explore+file+manager+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 16792 bytes
font_01_sfnt_off0000c72d.bin
75e8c5eb913676ff2253bd1134638bb48c9568ec7aa24a37d9e943a71175abe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 16156 bytes
font_02_sfnt_off0000f0a1.bin
d0f5d55e7970241ce040362ad620718f6c555600f376c089833a0c607006550d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10612 bytes

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